SEA LIFE Trust is a global marine conservation charity, working to protect the world's oceans and marine life through projects, campaigns, and their marine animal sanctuaries – the Cornish Seal Sanctuary and the Beluga Whale Sanctuary. They support practical local projects to protect marine and freshwater wildlife and their habitats, alongside working on conservation campaigns to effect long-lasting change on a global scale. At the same time, they champion the need for plastic-free oceans, sustainable fishing, effective Marine Protected Areas, and an end to an over-exploitation of marine wildlife around the world.

Founded in 2014 by Dr Simon Elwen and Dr Tess Gridley, Sea Search is principally a scientific organisation that aims to conduct high quality, internationally recognised research in the marine realm. The Sea Search group is a collective of scientists and students with a strong academic background in the area of marine mammal science. They also provide specialist consultancy services and work with industry and government to promote conservation through effective management. Amongst others, they are involved in Namibian Dolphin Project, are co-ordinating Killer Whale Research and Catalogue, and one of their core programmes is the African Bioacoustics Community

Sea Sense is a community based, Tanzanian NGO that is dedicated to the conservation and protection of endangered marine wildlife and their habitats in Tanzania. They work closely with coastal communities to conserve and protect endangered marine species including sea turtles, dugongs, whales, dolphins and whale sharks, and to support sustainable small-scale fisheries. Sea Sense started as the Tanzania Turtle & Dugong Programme in 2001. Within two years, over 230 nests had been protected and over 10,000 sea turtle hatchlings had safely reached the sea. Levels of nest poaching reduced dramatically from 80% to less than 2%.

Known for obstructing Japanese whaling activities in the Southern Ocean since 2005, Sea Shepherd Conservation Society is a Washington-based marine conservation organization with direct action tactics to save the oceans. Founded by Paul Watson, a former member of Greenpeace, in 1977, under the name Earth Force Society, the organization is involved in a number of 'controversial activities' to protect the ocean and marine life. Sea Shepherd Conservation Society carries out operations that involve direct, non-lethal tactics including scuttling and disabling whaling vessels, intervening in seal hunts and throwing bottles of foul-smelling butyric acid onto whaling vessels at sea, among others. As a response to the organisation's effort, the Japanese government has called Sea Shepherd eco-terrorists for impeding their research.

Seaflow was involved in protecting whales and other marine mammals. According to Wikipedia, Seaflow was a local non-profit ocean conservation organization based in Marin Country, California, dedicated to reducing and regulating ocean noise pollution from active Navy sonar and large vessels. They worked to protect whales, dolphins, and marine life in general from noise pollution "through science, creative action, the arts and community participation." The group appears to be inactive at this point.

The South African Whale Disentanglement Network (SAWDN) is a non-profit organization, collaborating with local and international organizations to reduce the suffering of entangled cetaceans, by releasing entrapped cetaceans in active fishing gear (including abandoned, lost or discarded gear). SAWDN provides a dedicated rescue action plan to assist entangled whales, prevent injuries and reduce mortalities to whales by removing gear as safely as possible. At the same time they collect data for international and national reporting of statistics to the International Whaling Commission and scientific purposes. SAWDN is also committed to working with the fishing industry to reduce entanglements. The network consists of multiple organizations in South Africa, including NSRI, SA National Parks, Mammal Research Institute, CapeNature, amongst many others. Telephone: 0726619516

Based in Kalpitiya in Northwest Sri Lanka, SLWCS's Marine Project addresses the conservation issues affecting Sri Lanka’s marine wildlife and is also providing opportunities for ecotourism and alternative livelihoods to promote sustainable development in the area. Their aim is to collect information about the current state of the area, including sea turtle, shark, dugong and pink dolphin conservation via nesting surveys, monitoring programmes, in-situ hatching projects, as well as educational workshops, beach clean-ups, mangrove planting, and waste management schemes. They also have an office in Nutley, New Jersey in the USA.

Submon aims to conserve marine biodiversity and to achieve the sustainable use of the marine environment by promoting a change in the relationship between society and the sea, through on-site actions and using and transmitting knowledge. The organization develops its own projects, mainly directed towards the conservation, the study and awareness of the marine environment, and always with a clear social and sustainable development character.This includes is a strong programme for schools and on ocean literacy. Their many and extensive projects include research and protection of whales, dolphins, sea turtles, molluscs, seagrass meadows, amongst others. An influential body, their expertise is widely sought after internationally.

The Swiss Cetacean Society-SCS is a non-profit organisation devoted to the preservation of marine mammals in their natural habitat. Based on the conviction that better scientific knowledge of the animals and their environment is essential to ensure efficient protection measures, SCS organises worldwide campaigns at sea for data collection on cetacean populations. This data is ultimately used in research. At the same time, SCS distributes general information about marine mammals to the Swiss public, encourages access to specialised training and organizes the logistics at sea of scientific and environmental programmes abroad.

Specialised in cetacean research, Tethys has generated one of the largest datasets on Mediterranean cetaceans and over 300 scientific contributions. Tethys aims to protect the Mediterranean biodiversity by promoting the adoption of a precautionary approach for the management of natural resources. Aim is to prevent the decline of marine species and to encourage a sustainable use of the marine environment. Tethys first conceived and proposed the creation of the Pelagos Sanctuary (in 1991) and of the Losinj Dolphin Reserve in Croatia (in 1993). Studies include: cetaceans in the Corso-Ligurian-Provencal basin, in the Adriatic Sea, and in the Ionian Sea, the Messina Strait and in several other Mediterranean and Atlantic areas. Research methods track and record the horizontal movements of whales, population studies, bioaccoustic research, photo-identification and behavioural sampling, remote biopsy sampling for genetic and toxicological analyses, and historical research, resulting in enormous photographic archives of cetacean images, that have resulted in the identification of over 1,500 individuals of eight Mediterranean species.

The Animal Fund (TAF) was established in 2015 with its primary focus on protection of the ocean, dolphins and whales, now a marine conservation group which aims to educate and raise awareness on the threats facing our oceans and marine life, via campaigns, events, conferences, presentations and online media. It has offices in Monaco, Denmark, France and the UK. Education is TAF’s cornerstone. TAF works every day with schools and universities to inform about the whale’s importance to the ecosystem and our survival. As some of the biggest threats to marine life are plastic pollution and overfishing, TAF’s aim is to inform about alternatives to plastic and finding solutions to overconsumption.

Founded in 1989, The Dolphin Project (TDP) in Georgia, USA, is an all-volunteer research, education and conservation organization dedicated to the protection of the wild, estuarine Bottlenose dolphin and their environment. TDP follows the guidelines of the Marine Mammal Protection Act (MMPA) and conducts Photo-ID dolphin research.